Mullins absolutely has a point.
I've gone through an embarassing number of fins.
I and my dive buddy here have ordered a total of four Starfins. They are all perfect in terms of size, and none show any of the common signs of falling apart that happened with my previous custom fins. But, as mullins points out, the fact that many of us have done well with Starfins is no guarantee.
To be specific - I've owned two other hyperfins. One was sized correctly, the other was so tight that it made my feet bleed. After 1/2 hour the pain was so intense I could no longer maintain proper form. Both these fins fell apart. We were able to repair them using a marine adhesive that seemed to hold up better than superglue. My fav of the two lasted about another year and then the blade snapped in half during pool training. My daughter had a fin come apart out in the middle of a small lake.
The Tropol footpockets are molded - all other hyperfins are hand made. In my experience the material the Tropol pockets are made from does not chaff like rubber - it gets sort of slimy when wet. I ordered the largest size they make - because I planned to use socks with it - but it was still excruciating so I devised an outside sock arrangement that works extremely well.
Good things about the Tropol
Durable
Comfortable
Excellent Blade
Consistent Sizing
Relatively inexpensive
The drawbacks of the Tropol M4 are that it is quite a heavy fin - and does not have the same organic feel as my Starfins. I have to qualify that by adding that my Tropol is really a sprint stiffness blade. Will Trubridge did not like my Tropol because of the heaviness - but he did like the blade. I like it, and usually forget I'm wearing it. Blade angle is around 20 degrees - which is pretty good (better than the 11 degrees of the Nemo). More blade angle optimizes thrust on the downstroke and enables glide with less arch/knee bending - I think it's more critical for dynamic that constant weight. I'd rate the Tropol and excellent recreational fin. The mass of it takes some getting used to - but also gives it nice authority.
Just to bust this thread up a little - heres me at the pool with my Tropol doing a 1.5 kick length.
YouTube - glide.AVI‏